Transcript Comparing and Ordering Decimals PPT
Comparing and Rounding Decimals Christine Berg Edited V Hamilton Comparing Decimals • Decimal Models • Equivalent Decimals • Number Line Decimal Models Tenth Hundredth Equivalent Decimals • Decimals that represent the same value • Example: 0.6 is equivalent to 0.60 0.6 = 0.60 Terminal Zeroes • Zeroes as last digit(s) of a number can be removed 0.6 = 0.60 Equivalent Decimals 0.6 0.60 Comparing Decimals Step 1: Stack all the numbers being compared so that all the place values are lined up. 87.0413 87.09 Comparing Decimals Step 2: Add terminal zeros so there are the same number of decimal places 87.0413 87.0900 Comparing Decimals Step 3: Underline the first number that is different in the numbers being compared 87.0413 87.0900 Comparing Decimals Step 4: Looking at the underlined digit, you can not tell which number is larger. It does not matter if there are additional numbers after the digit underlined! 87.0413 87.0900 THIS NUMBER IS LARGER! Comparing Decimals Step 4: Order numbers depending on the directions given. Pay close attention to whether you’re supposed to order from least to greatest or greatest to least! Which is greater: 0.6 or 0.58 ? 0.60 0.58 0.6 > 0.58 Which is greater: 0.6 or 0.58 0.6 0.58 Rounding Decimals Step 1: Underline decimal place we are rounding Rounding Decimals Step 2: Circle the number to the right of the underlined decimal place Rounding Decimals Step 3: If circled digit is greater than or equal to 5, then round the underlined number up (add one) Rounding Decimals Step 4: If circled digit is less than or equal to 4, leave the underlined number the same Rounding Decimals Try these: 1)Round 1.05 to the nearest tenth 2) Round 0.123 to the nearest tenth Rounding Decimals Answers: 1) 1.1 2) 0.12 In your Own Words Describe what you learned today about either reading OR rounding decimals.